[Freeswitch-users] Number of codecs offerred in SDP

Mark Campbell-Smith mcampbellsmith at gmail.com
Sun Jun 27 22:37:38 PDT 2010 

Hi All,

I'm not really sure if I got a firm answer for this one.  Is the only
way to ensure that transcoding is performed is by using
late-negotiation?  Why aren't all my codecs sent in the INVITE message
to the B-leg (extension 1020)?

Thanks!

On Thu, Jun 24, 2010 at 9:32 AM, Mark Campbell-Smith
<mcampbellsmith at gmail.com> wrote:
> FS version and codecs are shown below, but my config file are probably
> quite old.  But I guess they should still work?
>
> All codecs are loaded, and the call works if late negotiation is set
> on profile internal.
> As I wrote above:
> The call setup is extension 1000 calls extension 1020
> 1. Extension 1000 calls with preferred codec PCMU.  PCMU is chosen by
> FS as the A-leg codec
> 2. Extension 1020 only supports GSM codec.  The call fails with Not
> Acceptable Here.
>
> I forgot to write that Extension 1000 does not support GSM (I want to
> force transcoding).  Is that why FS is filtering out GSM on the b-leg?
>
> freeswitch at internal> version
> FreeSWITCH Version 1.0.head (git-9b5778f 2010-06-19 14-49-15 -0500)
>
> freeswitch at internal> show codecs
> type,name,ikey
> codec,ADPCM (IMA),mod_voipcodecs
> codec,G.711 alaw,CORE_PCM_MODULE
> codec,G.711 ulaw,CORE_PCM_MODULE
> codec,G.722,mod_voipcodecs
> codec,G.723.1 6.3k,mod_g723_1
> codec,G.726 16k,mod_voipcodecs
> codec,G.726 16k (AAL2),mod_voipcodecs
> codec,G.726 24k,mod_voipcodecs
> codec,G.726 24k (AAL2),mod_voipcodecs
> codec,G.726 32k,mod_voipcodecs
> codec,G.726 32k (AAL2),mod_voipcodecs
> codec,G.726 40k,mod_voipcodecs
> codec,G.726 40k (AAL2),mod_voipcodecs
> codec,G.729,mod_com_g729
> codec,GSM,mod_voipcodecs
> codec,H.261 Video (passthru),mod_h26x
> codec,H.263 Video (passthru),mod_h26x
> codec,H.263+ Video (passthru),mod_h26x
> codec,H.263++ Video (passthru),mod_h26x
> codec,H.264 Video (passthru),mod_h26x
> codec,LPC-10,mod_voipcodecs
> codec,PROXY PASS-THROUGH,CORE_PCM_MODULE
> codec,PROXY VIDEO PASS-THROUGH,CORE_PCM_MODULE
> codec,RAW Signed Linear (16 bit),CORE_PCM_MODULE
> codec,Speex,mod_speex
>
> 25 total.
>
>
> On Wed, Jun 23, 2010 at 11:05 PM, David Ponzone <david.ponzone at gmail.com> wrote:
>> Mark,
>> I confirm that, as I wrote that wiki page (the early negotiation part) :)
>> Can you really confirm your FS version ?
>> The parameter you showed is old.
>> codec-prefs has been replaced in SIP profiles by:
>>     <param name="inbound-codec-prefs" value="$${global_codec_prefs}"/>
>>     <param name="outbound-codec-prefs" value="$${outbound_codec_prefs}"/>
>> David Ponzone  Direction Technique
>> email: david.ponzone at ipeva.fr
>> tel:      01 74 03 18 97
>> gsm:   06 66 98 76 34
>> Service Client IPeva
>> tel:      0811 46 26 26
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>>
>>
>> Le 23/06/2010 à 14:43, Mark Campbell-Smith a écrit :
>>
>> Check this good wiki page for how FS negotiates codecs (early
>> negotiation default):
>> http://wiki.freeswitch.org/wiki/Codec_Negotiation
>>
>> I have this set in my internal profile:
>>    <param name="codec-prefs" value="$${global_codec_prefs}"/>
>>
>> and as stated before vars.xml:
>> <X-PRE-PROCESS cmd="set" data="global_codec_prefs=G729,PCMU,GSM"/>
>> <X-PRE-PROCESS cmd="set" data="outbound_codec_prefs=G729,PCMU,GSM"/>
>>
>> Setting late negotiation works (thanks Sergey), but reading the wiki
>> page, I see the following sentence, which I interpret that GSM should
>> still be sent:
>> When FS calls leg B, the list of codecs in outbound-codec-prefs for
>> the SIP profile is reorganized by pushing the codec negotiated above
>> for leg A at the top . If B does not accept any of the codecs, the
>> calls fails, obviously.
>>
>>
>>
>> On Wed, Jun 23, 2010 at 10:28 PM, Tony Graziano
>> <tgraziano at myitdepartment.net> wrote:
>>
>> I'm a newb to fs, but doesn't codec get neogtiated by the endpoints?
>>
>> Wouldn't fs only get involved when its media server is referred to?
>>
>> If the "other endpoint" will only accept G729, doesn't that mean you
>>
>> need to change that endpoint to also accept G711 or also license G729
>>
>> in FS?
>>
>> On 6/23/10, Mark Campbell-Smith <mcampbellsmith at gmail.com> wrote:
>>
>> Test Setup:
>>
>> vars.xml:
>>
>>   <X-PRE-PROCESS cmd="set" data="global_codec_prefs=G729,PCMU,GSM"/>
>>
>>   <X-PRE-PROCESS cmd="set" data="outbound_codec_prefs=G729,PCMU,GSM"/>
>>
>> The call setup is extension 1000 calls extension 1020
>>
>> 1. Extension 1000 calls with preferred codec PCMU.  PCMU is chosen by
>>
>> FS as the A-leg codec
>>
>> 2. Extension 1020 only supports GSM codec.  The call fails with Not
>>
>> Acceptable Here.
>>
>> FS only offers G729 and PCMU to 1020.  How do I change the number of
>>
>> codecs that are offered to an extension?  I know I can change the
>>
>> order in the codec_prefs, but would prefer FS to offer all three
>>
>> codecs to an extension.
>>
>>    m=audio 23662 RTP/AVP 0 18 101 13
>>
>>    a=rtpmap:0 PCMU/8000
>>
>>    a=rtpmap:18 G729/8000
>>
>>    a=rtpmap:101 telephone-event/8000
>>
>>    a=fmtp:101 0-16
>>
>>    a=rtpmap:13 CN/8000
>>
>>    a=ptime:30
>>
>> Thanks
>>
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>> --
>>
>> Sent from my mobile device
>>
>> ======================
>>
>> Tony Graziano, Manager
>>
>> Telephone: 434.984.8430
>>
>> sip: tgraziano at voice.myitdepartment.net
>>
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>>
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>>
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